In need of improving an existing Web APP built in Java/Spring using Vaadin as front-end. Need to add various new features and extend existing functionality, and fix some bugs. There are approximately 25-40 enhancements to do, ranging from very simple to more work. Please bid for a trial project of doing 5-10 enhancements. You can pick from the list which to work on at first. Some of these may require changes to the data model.